Quantum memory for light with a quantum dot system coupled to a nanomechanical resonator

2011 ◽  
Vol 11 (5&6) ◽  
pp. 456-465
Author(s):  
Jin-Jin Li ◽  
Ka-Di Zhu
Keyword(s):  
Quantum Dot ◽  
Quantum Information Processing ◽  
Optical Devices ◽  
Quantum Memory ◽  
Nanomechanical Resonator ◽  
Optomechanical Systems ◽  
Exciton Polaritons ◽  
All Optical ◽  
Optical Routers ◽  
Photon Pulse

The specific features including high factor and long vibration lifetime of nanomechanical resonator (NR) in nano-optomechanical systems have stimulated research to realize some optical devices. In this work, we demonstrate theoretically that it is possible to achieve quantum memory for light on demand via a quantum dot system coupled to a nanomechanical resonator. This quantum memory for light is based on mechanically induced exciton polaritons, which makes the dark-state polariton reaccelerated and converted back into a photon pulse. Our presented device could open the door to all-optical routers for light memory devices and quantum information processing.

Generation of helical topological exciton-polaritons

Science ◽  
2020 ◽  
Vol 370 (6516) ◽  
pp. 600-604 ◽  
Author(s):  
Wenjing Liu ◽  
Zhurun Ji ◽  
Yuhui Wang ◽  
Gaurav Modi ◽  
Minsoo Hwang ◽  
...  
Keyword(s):  
Time Reversal ◽  
Quantum Information Processing ◽  
Optical Devices ◽  
Time Reversal Symmetry ◽  
Cryogenic Temperatures ◽  
Experimental Realization ◽  
Strong Magnetic Fields ◽  
Strongly Coupled ◽  
Spintronic Devices ◽  
Exciton Polaritons

Topological photonics in strongly coupled light-matter systems offer the possibility for fabricating tunable optical devices that are robust against disorder and defects. Topological polaritons, i.e., hybrid exciton-photon quasiparticles, have been proposed to demonstrate scatter-free chiral propagation, but their experimental realization to date has been at deep cryogenic temperatures and under strong magnetic fields. We demonstrate helical topological polaritons up to 200 kelvin without external magnetic field in monolayer WS2 excitons coupled to a nontrivial photonic crystal protected by pseudo time-reversal symmetry. The helical nature of the topological polaritons, where polaritons with opposite helicities are transported to opposite directions, is verified. Topological helical polaritons provide a platform for developing robust and tunable polaritonic spintronic devices for classical and quantum information-processing applications.

scholarly journals Procedure via cross-Kerr nonlinearities for encoding single logical qubit information onto four-photon decoherence-free states

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jino Heo ◽  
Seong-Gon Choi
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Photon Number ◽  
Optical Devices ◽  
Quantum Bus ◽  
Reliable Procedure ◽  
Optical Gates ◽  
Photon Loss ◽  
Decoherence Effect ◽  
Logical Qubit

AbstractWe propose a photonic procedure using cross-Kerr nonlinearities (XKNLs) to encode single logical qubit information onto four-photon decoherence-free states. In quantum information processing, a decoherence-free subspace can secure quantum information against collective decoherence. Therefore, we design a procedure employing nonlinear optical gates, which are composed of XKNLs, quantum bus beams, and photon-number-resolving measurements with linear optical devices, to conserve quantum information by encoding quantum information onto four-photon decoherence-free states (single logical qubit information). Based on our analysis in quantifying the affection (photon loss and dephasing) of the decoherence effect, we demonstrate the experimental condition to acquire the reliable procedure of single logical qubit information having the robustness against the decoherence effect.

All optical quantum dot spin manipulation

2005 ◽  
Author(s):  
M. Atature ◽  
J. Dreiser ◽  
A. Hogele ◽  
S. Seidl ◽  
M. Kroner ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Manipulation ◽  
All Optical

Multi-objective optimization of two-dimensional phoxonic crystals with multi-level substructure scheme

2016 ◽  
Vol 30 (09) ◽  
pp. 1650046 ◽  
Author(s):  
S. Zhang ◽  
J. Yin ◽  
H. W. Zhang ◽  
B. S. Chen
Keyword(s):  
Optical Devices ◽  
Two Dimensional ◽  
Regular Pattern ◽  
Multi Objective Optimization ◽  
New Materials ◽  
Optomechanical Systems ◽  
Multi Objective ◽  
Design And Synthesis ◽  
Multi Level ◽  
Photonic Band

Phoxonic crystal (PXC) is a promising artificial periodic material for optomechanical systems and acousto-optical devices. The multi-objective topology optimization of dual phononic and photonic max relative bandgaps in a kind of two-dimensional (2D) PXC is investigated to find the regular pattern of topological configurations. In order to improve the efficiency, a multi-level substructure scheme is proposed to analyze phononic and photonic band structures, which is stable, efficient and less memory-consuming. The efficient and reliable numerical algorithm provides a powerful tool to optimize and design crystal devices. The results show that with the reduction of the relative phononic bandgap (PTBG), the central dielectric scatterer becomes smaller and the dielectric veins of cross-connections between different dielectric scatterers turn into the horizontal and vertical shape gradually. These characteristics can be of great value to the design and synthesis of new materials with different topological configurations for applications of the PXC.

A Lossless Negative Dielectric Constant from Quantum Dot Exciton Polaritons

Nano Letters ◽  
2008 ◽  
Vol 8 (5) ◽  
pp. 1551-1555 ◽  
Author(s):  
Y. Fu ◽  
L. Thylén ◽  
H. Ågren
Keyword(s):  
Dielectric Constant ◽  
Quantum Dot ◽  
Exciton Polaritons
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